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the cockpit and non-essential communications
between the cabin and cockpit crews,
and reading publications not related to the
proper conduct of the flight are not required for
the safe operation of the aircraft.
(c) For the purposes of this section, critical phase
of flight involves all ground operations involving
taxi, takeoff and landing, and all other flight
operations conducted below 10,000 feet, except
cruise flight.
Note: Taxi is defined as “movement of an
airplane under its own power on the surface of
an airport.”
22 Issue Number 4
Recommendations and Considerations
The sterile cockpit rule was designed to help minimize many of the
problems that we just annotated. Judging from these reports, a safer
operation can be achieved by simply abiding by the rule’s guidelines.
In the Beginning
A good time to establish the desire to maintain a sterile cockpit
environment is before beginning a trip. In briefing cockpit and cabin
crew members the captain can politely say, “I think the sterile
cockpit rule is really important, so we’ll adhere to it. Okay?”
Setting the Standards
During the preflight briefing the captain should also inform the
flight attendants how they can determine if the flight is above or
below 10,000 feet. Many companies have already established
procedures for this, such as a “10,000 foot PA announcement,” or a
call to the flight attendants on the interphone. However, these
procedures require one crew member to be “out of the loop.” And as
evidenced by literally thousands of ASRS reports, the potential for
problems (such as misunderstood clearances and altitude deviations)
increases when a crew member is out of the loop. Some airlines have
installed a cockpit-controlled “sterile cockpit light” that can be
illuminated when descending below 10,000 feet and extinguished
when climbing above 10,000 feet. For those who develop company
procedures, consideration should be given to developing something
that doesn’t create its own set of distractions. With the increased use
of two-crew member cockpits this consideration is increasingly
important.
Unexpected Entry
Unexpected calls or cockpit entry by flight attendants during the
sterile cockpit period can be distracting and potentially dangerous. It
is recommended that the Captain, during the pre-departure crew
briefing, emphasize the importance of the sterile cockpit rule and
request that flight attendant calls or entry during this time be
undertaken only for reasons of great urgency. As one reporter
resolves:
“The next time a flight attendant enters a sterile cockpit, I will
immediately ask if there is an emergency.” (ACN 109249)
High Altitude Airports
Another reporter offered a good suggestion
involving high elevation airports, where 10,000
feet MSL for the sterile cockpit boundary may be
too low.
“The First Officer and myself were involved in a
conversation with the company pilot riding jump
seat. Although I subscribe to the sterile cockpit
rule below 10,000 feet, I failed to realize that, due
to Denver’s high field elevation, 17,000 feet MSL
would have [been] a more appropriate time to
discontinue our conversation and be sure that
our affairs were in order...Unfortunately, because
of our conversation, I failed to slow to 250 knots
until passing Kiowa...The main reason I am
filing this report is that I was habitually using
10,000 feet MSL for focusing my attention on the
terminal/approach procedure and maintaining a
sterile cockpit. A better method would certainly be
10,000 feet AGL or 40 to 50 miles from destination.”
(ACN 65327)
Low Altitude Flight
This reporter, a commuter pilot who often has
cruise altitudes below 10,000 feet MSL, offers a
similar worthwhile suggestion following an
altitude deviation.
“I believe this situation occurred because our
cruise altitude was 8000 feet, and we were
accustomed to conversation and other activities
along the route and were not observing the ‘sterile
cockpit’ environment. Would suggest that, in these
flight circumstances where cruise altitude is less
than 10,000 feet, crews make a specific DME
mileage their beginning for ‘total concentrationsterile
cockpit’ procedures.”
(ACN 173707)
No person about to undergo major surgery would
think too kindly of the surgical team who failed to
sterilize themselves and their operating instruments
before the operation. After a series of air
　
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